Cloth-cutting machine.



Y'w1-171. MAIIN. CLOTH CUTTING' MACHINE. v PPLIUATION FILED In' no, 1911. Patllted Sept. 12, 1911.

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Z6 mwen/Tore` afl" ' ArroRNEY H. MAIMIN. GLOT CUTTING MACHINE. APPLIOATION 111.1111 nam-1911.

Patented sept. 12,1911.

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INVENTOR M Z! 'L' f ATTRNEY WITNESSE HYMAN MAIMIN, OF NEW YORK, N. Y.

CLOTH-CUTTING MACHINE.

Specication of Letters Patent.

Patented sept. 12, 1911.

Application ledlMay 20, 1911. Serial No. 628,407.

panying drawings, forming apart of this specification.

My inventlon relates to cloth-cuttingVV machines and particularly to that type of such machines employing a vertically-reciproeating cutting blade usually driven through suitable connectingA actuating mechanism from the shaft of an electric motor mounted on the main frame. Such machines are well known, an example of the type being shown in U. S.- patent to Ballard, No. 873,285 dated December 10, 1907. In such machines of that type, no means forming any part of the machine proper, have ever been provided for sharpening the cutting blade, though in such machines having a rotating disk-shaped blade or cutter, primitive means have been utilized consisting of one or more grinding stones mounted in a frame hinged to some part of the mechanism adjacent thereto.

The object of 'my invention is to provide adequate knife-sharpening mechanism normally out of contact with the knife blade, including means to operatively support and act-uate it, and means' to shift it into and out of operative position relatively to t-he knife blade, without stopping the machine and the actuation of its cutting blade.

To these ends my invention consists of certain novel elements in combination with each other and with the frame of the machine and its adjunctive parts, including its presser-foot and its cutting blade and the supporting and actuating devices therefor; as hereinafter described in detail ,the novel and essential characteristics being recited in =the several appended claims.

In the accompanying drawings, Figure 1 is a. front elevation of my improvements, including enough of a known type of a clothcutting machine to illustrate the application of my invention thereto.' Fig. 2 is a side elevation thereof, and Fig. 3 a lateral section of the same, on line (L -a of Fig. '2. Fig. 4 is a vertical section, partly in elevation, of the blade-sharpening device, detached, the parts being in operative ordownward posit-ion and seen from one side, and Fig. 5 a like view of the same, looking from the front, and with the parts in elevated and inoperative position. Fig. 6 is a side eleva tion of t-he lower end of the sharpening device in operative position relatively to the cut-ting blade, the presser-foot iny inoperative position; and Fig. 7 is a like view of the same, with the presser-foot in operative position, and the sharpening device in raised or inoperative position.

Referringy now to said drawings: 1 indicates a portion of the main frame of the machine inclosing the motor (not shown) which actuates, through appropriate oonnections, the vertically-reciprocating cutting blade. l

2 is the articular portion of the frame, includinglthe bracket 16 and the bearingsB and 4 forming part of it, on which my improvenient is mounted; 5 is the driving rod on the lower end of which the verticallyreciprocating cutting blade G is detachably 4mounted by the set-screw 7. The said driving rod is actuated by suitable connections between it and the motor.

8 is the foot-plate from which the standard9, forming p-art of the main frame, proceeds. The standard may have a roove,

indicated by the dotted line, in which the cutting blade is guided in its vertical reciprocation.

10 is the presser-foot, which is preferably be swung free from the blade, as shown in Figs. 2`and 6 for the purpose of sharpening the blade.

Mounted xedly on the lower end of the portion 2 of the main frame is a bracket frame 16 having tubular bearings 3 and 4 at its top and bottom ends; and in a recess in the rear of the upper bearing 4 is let in a pinion 12 (see Fig. 2) carried on end of a short shaft 12a actuated by hand wheel 12b (see Fig. 1) for the purpose of vertically adjusting the tubular shaft 19. Said shaft has such vertical adjust-ing movement impartedt-o it by means of a rack 18 formed on a rearward part of its periphery. Between its bearings 3 and 4 the said shaft is Prefera'bly encircled by a spring 16, to give it some reverse tension when said shaft is`- elevated, by the aforesaid rack and pinion,`Vr

therebeing a ring 16al fast on said shaft;

i. anda ring nut 13 may be provided to fixedly ,hold said lparts relativel The lower end of the tubu ai" shaft 19 is slotted, as indicated atI 21; the extreme end of the slot being narrowed, as indicated 4at 4). These spring .arms have on outwardlyextending tendency, as indicated in Fig. 5, so that when on the completion of their .tively to the cuttin last named figure.

downward movement in the tubular'shaft 19,.reaching the narrowed portion 22 of the slot 21 in said shaft `(see Fig. 5) they will be brought together as seen 1n Fig. 4. On the lower free end of each spring arm 23 is mounted a stub-shaft 28 on which is carried, preferably rotatably, a cylindrical. grinding stone 26; and it is of some importance that these stub-shafts should be so, relatively to each other, that the two grinding'stones will be in slightly different horizontal planes. A In operative position, to sharpen the cutting blade, as indicated in Figs. 2 and 6, they will therefore sharpen adjacent but different sections of the blade on the two sides of its edge.

The presser-foot`10, as shown, is novel with me, in respect of its mounting and mode of operating resultingtherefrom. To these ends-it is carried by its yoke-like stem, throughl each member of which passes a pivot pin 27, which in turn passes through the wall of the tubular shaft 19. Mounted fast on this pin 27 is a sector 24 having two slots 24, 24", and mounted loose on the same pin` isv a spring-actuated finger 25 which engages one of said notches of the sector in the operative or normal position of the presser-foot (Fig. 7), and the other of said notches in the inoperative position thereof (Fig. 6) which latter is the operative position `of the rinding stones rela- .lade, as seen in the he sector and pivot pin aforesaid are actuated by contact with the spring arms 23, 23, on theterminus of their downward movement. Mounted on lthe-portion 2 of themain frame of the machine is a guiding bracket 11 through a hole in which-passes' the upper end of the actuating stem 20; and on the upper end of this stem is an'impact knob 22, whileencircling the stem and resting on said bracket-bearing 11 is a coiled spring 21, shown in ldis-4 tended position in Fig. 1 and under com- .pressed tension in Fig. 2; the function of which is to restore the actuating stem and the elements carried 'by it to normalupward positionafter each manual pressure on the impact knob. y

The` operation of the device is, briefly stated, as followsz-The Amaterial to be cut is laid on the foot-plate...` As it varied in thickness or depth, and ,thepresser-foot is required to rest upon it during the. operative reciprocationof the cutting blade, that end is accomplished by actuating the handwheel 12", causing the pinion 12 to act on the rack 18 on the wall of the tubular shaft 19, carrying the latter and its appendant presser-foot upward or downward as required. lIn that operative position of the presser-foot, relatively tothe work, its rearward bifurcated portion 10a embraces, but does not contact with, the edge` of the reciprocating blade, and to that extent operates as a guard. l This position of the several parts is shown in Figs. l and'7, and is their operative position during the actuation of the machine in cutting goods.

To sharpen the cutting blade, either with or without stopping the actuation of the cutting blade, the stem 20 is depressed, by intermittent manual pressure on the impact knob 22, the first depression throwing A the presser foot into the position shown in Figs. 2 and 6, the spring pin 25 dropping into the appropriate notch 24a in the sector 24 and holding the presser-foot in inoperative position temporarily as shown, while each downward reciprocating movement of the spring-arms 23 in the slot 21, including its contracted end 22, compresses the sprin arms and brings the grinding stones carrie thereby into contact with the opposite sides of the cutting blade. If the machine is stopped, repeated manual impacts on the impact knob will give a sufiiclent and perfect grinding eiiect, particularly with the stones in adjacent but varying horizontal the impact knob will be suthcient. By my improvement Iam not lonly able to provide means to perfectly sharpen the blade, but the mechanical adjuncts thereof are of such nature that they are utilized to support and actuate the presser-foot, both for and for inoperativepositions. 1

Having thus described my invention, I claim as new Patent 1. -a cloth-cutting machine, the combinatiOn-fwith the main frame and a cutting bla'de operatively mounted therein, of a tubular shaft mounted vertically adjustable in a plane in front of and adjacent to the vertical plane ofthe blade, a bearing for said-shaft, a pair of grinding stones supported on each side'of the blade and normally. out of'contact therewith, 'a pair of spring arms mounted tslidingly in said shaft and desire to secure by Lettersoperative lsaid shaft in its bearing; a slidin and carrying said stones, and meansto reciprocate said spring arms and compress them toward each other on their downward reciprocatory movement. y

2: In combination, in 'a cloth-cutting machine, a cutting blade, a bracket-bearing mounted on the main frame adjacent to the- -class recited, including its main frame and cutting blade, of a bracket bearin mounted on the front of said frame adjacent the vertical plane of the blade, a tubular shaft slotted at its lower end mounted vertically adjustable in said bearing, a presser-foot pivotally supported adjacent the end of said shaft, a sliding stem mounted sleeve-like therein, a pair of spring arms supported and actuated by said stem and adapted on their downward movement to swing the presserfoot on its pivotal bearing, a pair of grinding stones carried by said spring arms, and means to compress said spring arms on their downward j reciprocatory movement and bring the stones in operative Contact with the blade.

4. In a machine of `the class recited, the combination with its main frame and cutting blade, a bracket comprising two' bearing rings and mounted on said frame adjacent to the vertical plane of the cutting blade, a tubular shaft vertically adjustable in said bearings, a tension device therefor operating between said bearing rings, a: presser-foot pivotally connected to the lower end of 'said shaft, devices slidingly mounted in said tubular shaft, a pair of grinding stones rotatably mounted in varying. horizontal planes and carried by said sliding devices, for the purposes set forth. l

5. In combination, in a cloth-cutting machine, a cutting blade, a foot-plate and a standard rising therefrom, a bracket-bearing mounted thereon adjacent the vertical plane of the blade, a tubular shaft mounted vertically adjustable in said bearing, a presserfoot pivoted at the lower end of said'tubular shaft, a notched sector .coacting therewith,

j a spring controlled p in governing the same,

devices mounted to reciprocate in said tubular shaft and adapted, by contact with the sition during the sharpeningof the-cutting blade, and means to Vsharpen the blade.

6. In a cloth-cutting machinecomprising a' cutting blade, a foot-plate and a standard rising therefrom, the combination therewith .respective ends of said spring arms and Of'a bracket bearing mounted adjacent the vertical plane of the blade, a tubular shaft mounted vertically adjustable in .Said bearing, a presser-foot hinged to the lower end of said tubular shaft and having a. slotted rear portionadapted -to embrace' the blade edge as a guard, when'in normaljgo'perative position,l a stem mounted to reciprocate in said tubular shaft, means actuated by the downward movement of said stem, and operating by contact with said presser-foot to swing it out of normal position to clear the edge of the cutter blade, with means to sharpen the blade actuated by said stem and its adjuncts. j

7. In a cloth-cutting machine, the combination with the main frame anda cutting device, of a vertically adjustable tubular shaft, slotted longitudinally, bearings supporting said shaft in a vertical plane adjacent the cutting device, a presser-'foot hinged. to the lower end of said shaft, and a notched spring-controlled sector governingsaid hinge; a stem mounted slidin ly 1n said shaft, resilient means to maintain said stem normally in raised position, aA pair of spring arms carried by said stem, a pair of grinding stones carried 1n spaced relation by the adapted, on compression of said spring arms, to be brought into operative contact with thev opposite sldes of the cutting edge of the blade.

8. The combination, in a cloth-cutting machine, with the main frame'and a cut- 100 I vice, of. a pair of dependingly-mounted l spring arms, a pair of grinding stones rotatably mounted on vthe free ends thereof, means operating to impart vertical movement to said elements and to maintain them normally ina plane above that of the cutting device and in parallel vertical planes alining with the opposite faces of the cut-l ting device; means .operating to automatically compress said spring arms on their downward reciprocatory lmovement to bring'125 the grinding stones carried thereby into o eratlve relation to the cutting device to' e sharpened, and resilient means adapted to restore said last-mentioned elements to normal position.

10. `n-a cloth-cutting machine, the combination with the main frame and a cutting device, of a pair of de endingly-mounted spring arms of varying engths, and a pair of grindin stones rotatably mounted, in different p anes, on their respective free ends; means to operatively support and im` part vertical reciprocatory movement to said elements, means to compress said spring arms onl their .downwardreciprocatory movement to bring the stones against the opposite edgesof the cutting device, in different planes, and resilient means to cause a f return movement of said elements to normal position and relation.

11. In a cloth-cutting machine, the combination with its main frame and cuttin device, of a pair of dependingly-mounte spring arms of slightly varying lengths, a

pair of grinding stones .rotatably mounted on the respective free ends of said arms, means to support said spring arms and grinding stones normally above the plane of the cutting device to impart vertical reciprocatory movement, and in vertical planes parallel with the opposite faces of the cutting device, and means to automatically compress said spring arms on their downward reciprocatory movement to bring the v mossel erent tplanes with the opposite faces of the edge o the cutting device'.

12. In a cloth-cutting machine, the combination with its main frame and a cutting device, of a tubular shaft, a vertically-adjustable bearin therefor.` mounted on the .frame,a stem Va apted to reciprocate in said shaft, a pair of spring arms carried by said stem, a grinding stone on the free end of each spring arm, resilient means to sulpport said elements above the plane of t e cutting device and with said stones in arallel vertical lanes adjacent to the pat of travel of the Blade edge thereof; said tubular shaft having a gradually narrowed longitudinal slot operating to compress said spring arms on their downward movement, to bring the grinding stones carried thereby into operative relation t-o the edge faces of the cutting device to be sharpened.

In testimony whereof, I have hereunto af fixed my signature this sixth day of May 4HYMAN MAIMIN.

`'Witnessesz A. M. BIDDLE,

R. A. DUNLAP.

inding stones into rotative contact in dif` 

